WO2018107452A1 - Dispositif et procédé de communication optique et antenne de transmission dans un système de communication optique en espace libre - Google Patents

Dispositif et procédé de communication optique et antenne de transmission dans un système de communication optique en espace libre Download PDF

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Publication number
WO2018107452A1
WO2018107452A1 PCT/CN2016/110296 CN2016110296W WO2018107452A1 WO 2018107452 A1 WO2018107452 A1 WO 2018107452A1 CN 2016110296 W CN2016110296 W CN 2016110296W WO 2018107452 A1 WO2018107452 A1 WO 2018107452A1
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WIPO (PCT)
Prior art keywords
optical signal
optical
unit
light
communication device
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PCT/CN2016/110296
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English (en)
Chinese (zh)
Inventor
赵平
石晓钟
叶亚斌
格尔杰格洛特
刘宁
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华为技术有限公司
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Priority to CN201680091490.8A priority Critical patent/CN110050416B/zh
Priority to PCT/CN2016/110296 priority patent/WO2018107452A1/fr
Publication of WO2018107452A1 publication Critical patent/WO2018107452A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum

Definitions

  • Embodiments of the present invention relate to the field of communications, and more particularly, to an optical communication apparatus and method and a transmit antenna in a free space communication system.
  • OWC Optical Wireless Communication
  • High-speed outdoor OWC usually uses 1550nm infrared light wave as the carrier wave, and uses a beam with a very small divergence angle to transmit the signal.
  • the beam divergence angle is less than 0.1 degree.
  • factors such as external jitter tend to cause the beam to deviate from the receiving antenna, causing the optical path to be interrupted. Therefore, the use of tracking technology to perform antenna alignment to ensure that the power of the received optical signal is above the sensitivity required by the photodetector is an important research direction in the field.
  • Embodiments of the present invention provide an optical communication apparatus and method and a transmitting antenna in a free space communication system, which are advantageous for achieving antenna alignment in a free space communication system by signal tracking.
  • an optical communication device in a free space communication system comprising: a light emitting unit for transmitting a first optical signal having a first wavelength; and a light converting unit configured to receive the first light emitted by the light emitting unit An optical signal, the first partial optical signal of the first optical signal is converted into a second optical signal having a second wavelength, and the second partial optical signal and the second optical signal of the first optical signal are output, wherein And the second optical signal is used as beacon light for performing signal tracking, the second partial optical signal is used as communication light for carrying customer data, and the transmitting unit is configured to send the optical conversion unit to the first opposite communication device. The second partial optical signal and the second optical signal are output.
  • the first peer communication device and the optical communication device may be disposed at two spaced locations and may be at respective distal ends of the other party.
  • the second partial optical signal can be used as communication light, wherein the communication light can be an optical signal carrying customer data.
  • the second optical signal can be used as beacon light, wherein the beacon light can be used to track communication light for antenna alignment.
  • the first peer communication device can be based on the beacon light, The transmission direction of the communication light is tracked, and then the spot position of the communication light is controlled to be at the center of the fiber.
  • the optical communication device transmits a first optical signal having a first wavelength by the light emitting unit, and the optical conversion unit performs a frequency conversion conversion process on the first partial optical signal of the first optical signal to obtain a second optical signal.
  • a second optical signal of a wavelength the transmitting unit transmitting the second optical signal and the second partial optical signal of the first optical signal to the first peer communication device, so that the first peer communication device can be according to the second Part of the optical signal is antenna aligned to improve signal transmission performance.
  • the second optical signal and the second partial optical signal can be transmitted to the free space through the same optical path, no additional setting is needed for transmitting the signal.
  • the light-emitting unit of the light source and the light path for transmitting the beacon light thereby saving equipment cost and size and design complexity.
  • the second wavelength is less than the first wavelength.
  • the first wavelength is an integer multiple of the second wavelength;
  • the light conversion unit comprises: a light frequency doubling crystal.
  • the first optical signal may be subjected to frequency conversion processing using a light frequency doubling crystal to convert the first partial optical signal of the first optical signal into the second optical signal.
  • the first optical signal is incident on the optical frequency doubling crystal from the first surface, and is reflected from the third surface by the second surface of the at least one second surface of the optical frequency doubling crystal.
  • a light frequency doubling crystal wherein the first surface and the third surface are plated with an anti-reflection film, and the at least one second surface is plated with a reflective film.
  • the first optical signal may be incident on the first frequency doubling crystal perpendicular to the first surface, and the light doubling crystal may be emitted perpendicular to the third surface.
  • first surface and the third surface may be perpendicular to each other, and an angle between the second surface and the first surface and the third surface may be 45 degrees.
  • the first surface, the second surface, and the third surface may both be sides of the optical frequency doubling crystal, and the thickness h of the light doubling crystal may be greater than the first optical signal incident on the optical frequency doubling
  • the beam diameter at the time of the crystal is 2w 1 to reduce the loss of the first optical signal.
  • the first optical signal can be transmitted in the optical frequency doubling crystal for a sufficiently long distance to improve conversion efficiency.
  • the photomultiplying crystal has at least one chamfer, and the at least one second surface includes the at least one chamfered surface.
  • the chamfer angle may be a 45-degree chamfer.
  • the photo-doubling crystal may be obtained by cutting a crystal having a square shape into three right angles.
  • the chamfered surface can serve as a reflective surface for the first optical signal.
  • the distance L eff transmitted by the first optical signal in the optical frequency doubling crystal satisfies the following conditions:
  • P T, C S C + M C + P R, C + L Rx, C + L A, C + L G, C + L Tx, C ,
  • P T, B S B + M B + P R, B + L Rx, B + L A, B + L G, B + L Tx, B ,
  • P T, C is the power of the second partial optical signal when incident on the optical frequency doubling crystal
  • S C is the sensitivity of the first detector for receiving the second partial optical signal in the first peer communication device
  • P R, C is the power when the second partial optical signal reaches the first detector
  • L Tx, C is the loss of the second partial optical signal in the first peer communication device
  • L G, C is the first The divergence loss of the two partial optical signals
  • L G, C is the atmospheric absorption loss of the second partial optical signal
  • L Rx, C is the loss of the second partial optical signal in the opposite communication device
  • M C is the first two link margin portion of the optical signal
  • P T, B for the second optical signal incident to the optical power when the frequency doubling crystal
  • the sensitivity of the second detector, P R, B is the power when the second optical signal reaches the second detector
  • L Tx, B is the loss of the second optical signal in the optical conversion unit
  • the optical path can be designed based on the actual link power budget and the appropriate device parameters can be selected.
  • the optical conversion unit further includes: a width conversion unit, configured to receive the first optical signal transmitted by the illumination unit, and receive the The beam width of the first optical signal is converted from the first width to the second width; the optical frequency doubling crystal is specifically configured to receive the first optical signal having the second width output by the width conversion unit, and the received A first partial optical signal of the first optical signal having the second width is converted into the second optical signal, and the second partial optical signal and the second optical signal are output.
  • the width conversion unit includes: a first convex lens and a concave through the optical path a mirror, wherein a focus of the first convex lens coincides with a focus of the concave lens.
  • the focal length f 1 of the first convex lens and the focal length f 2 of the concave lens satisfy the following relationship:
  • D 1 is the beam width when the first optical signal is incident on the first convex lens
  • 2w 1 is the beam width when the first optical signal is emitted from the concave lens
  • the sending unit is configured to: send, to the first peer communication device, a first light beam including the second partial optical signal and the second optical signal, where a beamwidth and/or a beam width of the first beam The divergence angle satisfies the preset condition.
  • the transmitting unit includes: a second convex lens and a third convex lens disposed in sequence along the optical path, wherein a focal length f 3 of the second convex lens The focal length f 4 of the third convex lens satisfies the following relationship:
  • D 2 is the beam diameter of the first beam.
  • the optical communications apparatus further includes: an optical amplifying unit, configured to receive the first optical signal that is sent by the illuminating unit, the first The optical signal is amplified, and the amplified first optical signal is output; the optical conversion unit is specifically configured to receive the amplified first optical signal output by the optical amplifying unit.
  • the optical communication device further includes: a receiving unit, a rotatable optical system, a light separating unit, a light detecting unit, and a control unit, where The receiving unit is configured to receive a second light beam sent by the second peer communication device, where the second light beam includes a third optical signal having a first wavelength and a fourth optical signal having a second wavelength; And guiding the transmission direction of the second light beam received by the receiving unit; the light separating unit is configured to receive the second light beam guided by the rotatable optical system, and separate the third optical signal in the second light beam and the a fourth optical signal; the light detecting unit is configured to receive a third optical signal of the second light beam transmitted by the optical separating unit, and perform demodulation processing on the data modulated in the third optical signal; the control unit is configured to: Receiving a fourth optical signal of the second light beam transmitted by the optical separating unit, and controlling an angle of the rotatable optical system
  • the third optical signal can be used as communication light, and the fourth optical signal can be used as beacon light.
  • the light separating unit comprises a splitter plate for separating the optical signals of the first wavelength and the second wavelength.
  • the control unit includes: a location detecting unit and an adjusting unit, where the location detecting unit is configured to receive the optical component Determining, by the unit, the fourth optical signal, determining a position of the optical center of the fourth optical signal, and transmitting information of the optical center position to the adjusting unit; the adjusting unit is configured to receive the optical center position transmitted by the position detecting unit Information and, depending on the information, adjust the angle of the rotatable light system.
  • the position detecting unit comprises: a silicon four quadrant detector.
  • the use of a silicon four-quadrant detector can reduce device cost compared to the use of an infrared four-quadrant detector or other device.
  • a second aspect provides a transmit antenna in a free space communication system, including: a receiving unit configured to receive a first optical signal transmitted by an optical transmitter; and a light converting unit configured to receive the first received by the receiving unit A first portion of the optical signal in the optical signal is converted to a second optical signal having a second wavelength, wherein the second optical signal acts as beacon light for signal tracking, and the second portion of the optical signal serves as carrier data for carrying
  • the communication unit is configured to send, to the first peer communication device, the second partial optical signal of the first optical signal and the second optical signal obtained by the optical conversion unit.
  • the receiving unit may comprise a receiving lens.
  • a receiving lens For example, a convex lens.
  • the first wavelength is an integer multiple of the second wavelength;
  • the light conversion unit comprises: a light frequency doubling crystal.
  • the optical conversion unit further includes: a width conversion unit, configured to receive the first optical signal transmitted by the optical transmitter, and convert the received beam width of the first optical signal from a first width to a first width a second width; the optical frequency doubling crystal is specifically configured to receive the first optical signal having the second width output by the width converting unit, and receive the first portion of the first optical signal having the second width The signal is converted into the second optical signal, and the second partial optical signal and the second optical signal are output.
  • a width conversion unit configured to receive the first optical signal transmitted by the optical transmitter, and convert the received beam width of the first optical signal from a first width to a first width a second width
  • the optical frequency doubling crystal is specifically configured to receive the first optical signal having the second width output by the width converting unit, and receive the first portion of the first optical signal having the second width The signal is converted into the second optical signal, and the second partial optical signal and the second optical signal are output.
  • the width conversion unit comprises: a first convex lens and a concave lens arranged in sequence along the optical path, wherein a focus of the first convex lens coincides with a focus of the concave lens.
  • the sending unit is configured to receive the second partial optical signal and the second optical signal output by the optical frequency doubling crystal, and send the second partial optical signal to the first peer communication device and the a first beam of the second optical signal, wherein a beamwidth and/or a divergence angle of the first beam satisfy a predetermined condition.
  • the sending unit includes: a second convex lens and a third convex lens disposed in sequence along the optical path, wherein a focal length f 3 of the second convex lens and a focal length f 4 of the third convex lens satisfy the following relationship:
  • D 2 is the beam diameter of the first beam.
  • the transmit antenna can be used to implement the functions of the optical conversion unit and the transmit unit in the first aspect or any possible implementation of the first aspect.
  • an optical communication device in a free space communication system comprising an optical transmitter and a transmit antenna in any of the possible implementations of the second aspect or the second aspect.
  • a fourth aspect provides an optical communication method in a free space communication system, including: transmitting a first optical signal having a first wavelength; performing a conversion process on the first optical signal to cause the first optical signal to be The first portion of the optical signal is converted to a second optical signal having a second wavelength; and the second portion of the first optical signal and the second optical signal are transmitted to the first peer communication device.
  • the first wavelength is an integer multiple of the second wavelength; the first optical signal is converted to convert the first partial optical signal in the first optical signal into a second optical signal
  • the optical signal includes: converting the first optical signal by using a light frequency doubling crystal to convert the first portion of the first optical signal into a second optical signal having the second wavelength.
  • the method before the converting the first optical signal by using the optical frequency doubling crystal, the method further includes: performing a width conversion process on the first optical signal, so that the beam width of the first optical signal is The width is changed to the second width; the converting the first optical signal by using the optical frequency doubling crystal comprises: converting, by the optical frequency doubling crystal, the first optical signal having the second width of the beam width.
  • the optical communication method can be performed by the optical communication device of the first aspect or any possible implementation of the first aspect.
  • the optical communication method may be performed by the optical communication device of the third aspect or any possible implementation of the third aspect.
  • FIG. 1 is a schematic block diagram of a typical optical communication device having a tracking function in a free space communication system.
  • FIG. 2 is a schematic block diagram of an optical communication apparatus according to an embodiment of the present invention.
  • FIG. 3a is a schematic perspective view of a light doubling crystal in an optical communication device according to an embodiment of the present invention.
  • Figure 3b is a top plan view of the optical frequency doubling crystal shown in Figure 3a.
  • FIG. 4 is a schematic diagram of an optical path of an optical communication device according to an embodiment of the present invention.
  • FIG. 5 is another schematic block diagram of an optical communication apparatus according to an embodiment of the present invention.
  • FIG. 6 is another schematic block diagram of an optical communication apparatus according to an embodiment of the present invention.
  • FIG. 7 is a schematic block diagram of another optical communication apparatus according to an embodiment of the present invention.
  • FIG. 8 is a schematic block diagram of a free space communication system according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of an optical path example of a free space communication system according to an embodiment of the present invention.
  • FIG. 10 is a schematic flowchart of an optical communication method according to an embodiment of the present invention.
  • Figure 1 shows an example of a typical optical communication device with a tracking function in a free space communication system.
  • the optical communication device 100 includes a lens 1 for receiving an illumination signal, and a lens 2 and a movable mirror 3 behind the lens 1 on the optical path.
  • the polarization beam splitter 4 The lens 5 and the illuminating device 6 are placed in the incident direction of the movable mirror 3, and the beam splitting mirror 7, the lens 8 and the position detector 9 are placed in the reflection direction of the polarizing beam splitter 4, and the lens 10 and the light receiving element 11 It is placed in the reflection direction of the beam splitting mirror 7.
  • the output of the multiplexer 12 is connected to the illuminating device 6, and the output of the transmitting signal input terminal 13 is connected to the multiplexer 12 via an amplifier 14, and the output of the oscillator 15 is also connected to the multiplexer 12.
  • the output of the light receiving element 11 is connected to the received signal output terminal 17 via an amplifier 16.
  • the output of the position detector 9 is connected to a tracking control circuit 18, and the output of the tracking control circuit 18 is connected to the movable mirror 3 by means of drivers 19 and 20 for adjusting the angle of the movable mirror 3.
  • the scope 21 for the observer to inspect the aiming axis is approximately parallel to the optical axis of the movable mirror 3.
  • the transmission signal is input through the transmission signal input terminal 13, amplified by the amplifier 14, multiplexed with the signal from the oscillator 15 in the multiplexer 12, and then output to the illuminating device 6.
  • the illuminating device 6 modulates the emitted light according to the input signal to convert the input signal into an optical signal.
  • the light beam output from the light-emitting device 6 reaches the polarization beam splitter 4 via the collimation processing of the lens 5, and since the polarization of the light beam is parallel to the drawing plane, the polarization beam splitter 4 transmits the light beam as it is.
  • the beam is reflected by the movable mirror 3 to the left and then transmitted through the lenses 2 and 1 to the opposite end device.
  • the light beam from the opposite end device Upon receiving the optical signal, the light beam from the opposite end device is incident on the left side of the lens 1, is reflected by the lens 2 to the movable mirror 3, and then reaches the polarized beam splitter 4. Since the direction of polarization of the beam is perpendicular to the plane of the drawing, the beam is reflected by the polarizing beam splitter 4 to the right and then separated by the beam splitting mirror 7 into two directions.
  • the light beam reflected by the beam splitting mirror 7 passes through the lens 10 to the light receiving element 11, and is converted into an electrical signal, which is then amplified by the amplifier 16 to an appropriate level, and then the amplified signal is The received signal output terminal 17 outputs.
  • the light beam projected by the beam splitting mirror 7 is concentrated by the lens 8, and then received as a point image by the position detector 9.
  • the position detector 9 detects the position of the point image S and outputs the position to the tracking control circuit 18 in the form of a position signal.
  • the tracking control circuit 18 calculates an angle of the light beam from the opposite end device with respect to the optical path of the optical communication device 100 based on the position signal, and transmits a drive signal to the drivers 19 and 20.
  • the drivers 19 and 20 adjust the angle of the movable mirror 3 such that the point image S falls at the center of the position detector 9. By this adjustment, the position of the illumination device 6 is also adjusted so that the optical path of the emitted beam coincides with the optical path of the incident beam, and the beam is accurately transmitted to the opposite end device.
  • the position detector 9 selectively detects an AC beacon signal of a specific frequency.
  • the beacon signal is generated by the oscillator 15 and is multiplexed with the transmission signal in the multiplexer 12 as an input signal of the illumination device 6, the illumination device 6 generating an optical signal of a specific wavelength according to the input signal and transmitting it to the pair End device.
  • the optical signal is separated into two parts, one for tracking and the other for transmission to the light receiving element 11. Since the optical transmission power in the free space communication system is limited, the signal for tracking partially causes power loss of the transmitted optical signal, so that the transmission power of the communication light is lower than the maximum transmission power, thereby reducing the communication quality and limiting the communication distance.
  • the maximum transmission power of the communication light can be improved while achieving antenna alignment, thereby improving communication quality and increasing communication distance. Improve system margin and overall performance.
  • FIG. 2 exemplarily shows an optical communication device 200 provided by an embodiment of the present invention.
  • the optical communication device 200 can be adapted to a free space communication system in which the optical communication device 200 and the first peer communication device can be separately located at two relative positions and can communicate by transmitting optical signals to free space.
  • the optical communication device 200 includes:
  • a light emitting unit 210 configured to emit a first optical signal having a first wavelength
  • the light conversion unit 220 is configured to receive the first optical signal emitted by the light emitting unit 210, convert the first partial optical signal of the first optical signal into a second optical signal having a second wavelength, and output the first optical signal. a second partial optical signal and the second optical signal, wherein the second optical signal serves as beacon light for performing signal tracking, and the second partial optical signal serves as communication light for carrying customer data;
  • the sending unit 230 is configured to send the second partial optical signal and the second optical signal output by the optical converting unit 220 to the first peer communication device.
  • the light emitting unit 210 can emit the first optical signal and transmit the first optical signal to the light converting unit 220, wherein the wavelength of the first optical signal is the first wavelength.
  • the illuminating unit 210 may include a laser, but the embodiment of the present invention does not limit this.
  • the optical converting unit 220 may perform frequency conversion processing on a part of the optical signals in the first optical signal to obtain a second optical signal, where the wavelength of the second optical signal is different from the first a second wavelength of one wavelength, and outputting another portion of the optical signal and the second optical signal of the first optical signal.
  • the sending unit 230 may send a first light beam to the first peer communication device by using a free space, where the first light beam may include the second optical signal and a second partial optical signal of the first optical signal.
  • the second optical signal can be used for signal tracking by the first peer communication device, that is, the second optical signal can be used as beacon light, and the second partial optical signal can be modulated with data, that is, the second portion.
  • the light signal can be used as communication light.
  • the first optical signal having the first wavelength is emitted by the light emitting unit, and the optical conversion unit performs a frequency conversion conversion process on the first partial optical signal of the first optical signal to obtain a second optical signal having the second wavelength, and the transmitting unit
  • the first peer communication device transmits the second optical signal and the second partial optical signal of the first optical signal, and the first peer communication device can use the second partial optical signal to perform antenna alignment, which is beneficial to improving the signal. Transmission performance.
  • the second optical signal and the second partial optical signal can be transmitted to the free space through the same optical path, no additional setting is needed for transmitting the signal.
  • the light-emitting unit of the light source and the light path for transmitting the beacon light save equipment cost and design complexity.
  • the optical converting unit 220 may perform up-conversion processing on the first partial optical signal in the first optical signal to obtain the second optical signal.
  • the wavelength of the second optical signal may be smaller than the wavelength of the first optical signal, that is, the second wavelength may be smaller than the first wavelength, but the relationship between the first wavelength and the second wavelength is not in the embodiment of the present invention. Make a limit.
  • the first wavelength may be an integer multiple of the second wavelength.
  • the first wavelength may be an even multiple of the second wavelength, for example, the first wavelength is 1550 nm, and the second wavelength is 775 nm.
  • the light conversion unit 220 may include one or more optical frequency doubling crystals, which may double the frequency of at least a part of the optical signals incident thereon, that is, at least a part of the optical signals The wavelength becomes one third of the original wavelength.
  • the first wavelength may be an odd multiple of the second wavelength.
  • the light conversion unit 220 may include one or more triple frequency crystals, and the triple frequency crystal The frequency of at least a portion of the optical signals incident thereon may be changed to three times the initial frequency, that is, the wavelength of at least a portion of the optical signals becomes one-third of the initial wavelength, but the embodiment of the present invention is not limited thereto.
  • the following description is made by taking the light conversion unit 220 including a light frequency doubling crystal as an example, but those skilled in the art should understand that the description is merely exemplary and not restrictive, and the light conversion unit in the embodiment of the present invention 220 may also have other implementations.
  • the photomultiplying crystal may have a shape such as a cube, a rectangular parallelepiped or a hexahedron.
  • the first optical signal may be incident on the optical frequency doubling crystal from the first surface, wherein the first surface may be a certain side of the optical frequency doubling crystal, and the first optical signal is at least one of the optical doubling crystals
  • the light frequency doubling crystal is emitted from the third surface, wherein the third surface may be a certain side of the light frequency doubling crystal, and is convenient for optical path design
  • the third surface may be different from the first surface, but embodiments of the invention are not limited thereto.
  • the first surface and the third surface may be plated with an anti-reflection film, and each of the at least one second surface may be plated with Reflective film.
  • the reflectance of the reflective film to the optical signals of the first wavelength and the second wavelength may be higher than 99.9%, and the transmittance of the antireflection film to the optical signals of the first wavelength and the second wavelength may be higher than 99.9%.
  • this embodiment of the present invention does not limit this.
  • the first optical signal may be incident on the optical frequency doubling crystal in the form of a parallel beam.
  • the first optical signal can propagate a sufficiently long distance within the optical frequency doubling crystal to convert the first portion of the first optical signal into a second optical signal.
  • the second optical signal and the second partial optical signal may exit the optical frequency doubling crystal in the form of a parallel beam.
  • the thickness of the optical frequency doubling crystal may be much larger than the incident beam diameter of the first optical signal.
  • the optical doubling crystal may have a thickness greater than 5 times the incident beam diameter of the first optical signal.
  • the at least one second surface may be the side of the light frequency doubling crystal, but the embodiment of the invention is not limited thereto.
  • the optical frequency doubling crystal may be processed.
  • the light frequency doubling crystal may be formed by cutting three right angles of a rectangular parallelepiped having an upper surface, wherein the square has a side length L, and the corner angle may be For a 45 degree cut angle, the chamfered surface (ie, the cut surface) may serve as a reflective surface of the optical signal, that is, the at least one second surface may include a cut surface, but the embodiment of the present invention is not limited thereto.
  • a reflective film may be plated on each of the three cut faces, and a transmissive film may be plated on both of the remaining right angle sides, but the embodiment of the invention is not limited thereto.
  • the beam diameter of the first optical signal may be transformed to meet the frequency conversion requirement.
  • the optical conversion unit 220 may further include: a width conversion unit, configured to receive the first optical signal transmitted by the illumination unit 210, and receive the received beam width of the first optical signal. Converting from the first width to the second width, and outputting the first optical signal having the second width of the beam width.
  • the optical frequency conversion crystal may be specifically configured to receive the first optical signal whose beam width is the second width of the width conversion unit, and perform frequency conversion processing on the received first optical signal having the second width. Obtaining the second optical signal and the second partial optical signal.
  • the second optical signal and the second partial optical signal may form a parallel beam, and a beam width of the parallel beam may be maintained at a second width, but the embodiment of the present invention Not limited to this.
  • the width transform unit may have multiple implementations.
  • the width conversion unit may include a first convex lens 222 and a concave lens 223 which are sequentially disposed along the optical path, wherein a focus of the first convex lens coincides with a focus of the concave lens.
  • the width D of the parallel beam incident on a convex lens 222 after the first can be emitted and enters the concave lens 223 in the form of a converging beam, since the The true focus of the first convex lens 222 coincides with the virtual focus of the concave lens 223, and the concentrated light beam can be converted into a parallel light beam having a width of 2w 1 after being refracted by the concave lens 223.
  • the focal length f 1 of the first convex lens 222 and the focal length f 2 of the concave lens 223 can satisfy the formula (1).
  • the optical frequency doubling crystal 221 can also have other forms of chamfering, and the optical path of the first optical signal in the optical doubling crystal 221 can be designed according to specific requirements. This example does not limit this.
  • the optical communication device 200 further includes a sending unit 230, configured to Receiving the second partial optical signal and the second optical signal output by the optical conversion unit 220, and transmitting, to the first peer communication device, a first light beam including the second partial optical signal and the second optical signal, where The beam width and/or the divergence angle of the first beam satisfy a preset condition.
  • the first light beam may be a parallel light beam or an approximately parallel light beam, wherein the first light beam may have a divergence angle of 0.2 to 1.5 mrad, but the embodiment of the present invention is not limited thereto.
  • the transmitting unit 230 can transmit the second partial optical signal and the second optical signal in the same light beam. Alternatively, the transmitting unit 230 can transmit the second optical signal and the second portion in an approximately parallel beam form. Optical signal, but embodiments of the invention are not limited thereto.
  • the sending unit 230 may send the second optical signal and the second partial optical signal through a convex lens.
  • the sending unit 230 may include: a second convex lens 231 and a third convex lens 232 which are sequentially disposed along the optical path, wherein the focal length f 3 and the third of the second convex lens 231 The focal length f 4 of the convex lens 232 satisfies the formula (2).
  • D 2 is the beam diameter of the first beam.
  • D 2 may be less than or equal to the diameter of the third convex lens
  • the focal points of the second convex lens 231 and the third convex lens 232 overlap on the optical path, but the embodiment of the present invention is not limited thereto.
  • the second convex lens 231 may be a self-focusing lens, wherein the self-focusing lens may be a cylindrical lens, and the length L G may be an odd multiple of the focal length f 3 , which is not limited in the embodiment of the present invention.
  • the distance between the optical doubling crystal 221 and the concave lens 223 and the distance between the optical doubling crystal 221 and the second convex lens 231 may be as short as possible, optionally, by the concave lens.
  • the optical path length L' of the 223 exit surface reaching the second convex lens 231 may satisfy the formula (3), but the embodiment of the invention is not limited thereto.
  • FIG. 4 is intended to help those skilled in the art to better understand the embodiments of the present invention and not to limit the scope of the embodiments of the present invention.
  • a person skilled in the art will be able to make various modifications or changes in the form of the embodiment of FIG. 4, and such modifications or variations are also within the scope of the embodiments of the present invention.
  • the proportion of the first partial optical signal in the first optical signal and the ratio of the first optical signal may be determined according to a power budget of the OWC link between the optical communication device 200 and the first peer communication device.
  • the parameters of the light doubling crystal For example, as shown in FIG. 5, in order to cause the second optical signal and the second partial optical signal transmitted by the optical communication device 200 through the OWC link to reach the first peer communication device, the power is at the first opposite end.
  • the transmission power P T of the second partial optical signal and the second optical signal may satisfy Equations (4) and (5), respectively, wherein the subscript B indicates as a beacon.
  • the relevant parameter of the second optical signal of light, subscript C represents the relevant parameter of the second part of the optical signal as communication light.
  • P T,C S C +M C +P R,C +L Rx,C +L A,C +L G,C +L Tx,C (4)
  • P T, B S B + M B + P R, B + L Rx, B + L A, B + L G, B + L Tx, B (5)
  • P T represents the transmission power of the optical signal, that is, the power when the optical signal is incident on the optical doubling crystal
  • S C represents the sensitivity of the corresponding detector of the optical signal, that is, the first pair of communication devices are used to receive the light.
  • the sensitivity of the detector of the signal P R represents the received power of the optical signal, that is, the power when the optical signal reaches the corresponding detector, and L Tx represents the transmit antenna loss of the optical signal, that is, the loss of the optical signal in the optical communication device 200, L G represents the divergence loss of the optical signal, L A represents the atmospheric absorption loss of the optical signal, L Rx represents the receiving antenna loss of the optical signal, that is, the loss of the optical signal in the first peer communication device, and M C represents the optical signal.
  • Link margin can be used to combat random attenuation caused by uncertainties such as rain and fog in the channel.
  • L G, C L G, B , and can be determined by equation (6):
  • ⁇ represents the divergence angle of the light beam in free space
  • the unit is millirad (mrad)
  • R represents the communication distance between the optical communication device 200 and the first peer communication device, and the unit is kilometer
  • D R represents the first The size of the receiving lens of the one-end communication device, in meters.
  • the parameters of the optical frequency doubling crystal may be determined according to equations (7) to (9).
  • n is the refractive index of the photomultiplying crystal
  • C is the vacuum light speed
  • ⁇ is the circular frequency of the first optical signal
  • d eff is the second-order nonlinear coefficient of the optical doubling crystal
  • ⁇ 0 is the vacuum dielectric constant
  • the effective length L eff of the optical frequency doubling crystal and the beam radius w 1 when the first optical signal enters the optical doubling crystal can be determined according to the power budget requirement, and the design is accordingly The optical path of the first optical signal.
  • Table 1 shows an example of the power budget of the OWC link, in which the transmission power of the communication light is 26.5 dBm (ie, 446 mW), and the transmission power of the beacon light is 15.8 dBm (ie, 38 mW), which is obtained by solving the above equation.
  • the relevant device parameters on the optical path can be determined according to the above L eff and w 1 , and a suitable device can be selected accordingly.
  • Table 2 shows parameter examples of the respective devices in the optical conversion unit 220 and the transmission unit 230 corresponding to the power budget example of Table 1, in which the unit of length is mm.
  • the optical communication device 200 may further include: an optical amplifying unit 240, configured to receive the first optical signal emitted by the lighting unit 210, and perform the first optical signal. The amplification process is performed, and the first optical signal after the amplification process is output.
  • the light conversion unit 220 may be specifically configured to receive the first light after the amplification process output by the optical amplifying unit 240. signal.
  • the optical amplifying unit 240 may be specifically an Erbium Doped Fiber Amplifier (EDFA), but the embodiment of the present invention is not limited thereto.
  • EDFA Erbium Doped Fiber Amplifier
  • the optical communication device 200 may further include: a first collimating unit 250 located before the optical switching unit 220 on the optical path, configured to perform collimation processing on the first optical signal, and output The first optical signal after the collimation process, wherein the first optical signal after the collimation process may be a parallel beam.
  • the optical conversion unit 220 may be specifically configured to receive the collimated first optical signal output by the first collimating unit 250.
  • the first collimating unit 250 can be disposed between the light emitting unit 210 and the light converting unit 220 on the optical path, specifically for receiving the first optical signal output by the light emitting unit 210, and illuminating the first light signal.
  • the first optical signal output by unit 210 is subjected to a collimation process.
  • the first collimating unit 250 may be disposed between the optical amplifying unit 240 and the optical converting unit 220 on the optical path, specifically for receiving the amplified processing output by the optical amplifying unit 240.
  • An optical signal is subjected to collimation processing on the amplified first optical signal output from the optical amplifying unit 240, but the embodiment of the present invention is not limited thereto.
  • the first collimating unit 250 may include a convex lens, but the embodiment of the invention is not limited thereto.
  • the optical communication device 200 can also be used to receive optical signals transmitted by other communication devices.
  • 6 shows functional units related to reception of optical signals in the optical communication device 200: a receiving unit 260, a rotatable optical system 265, a light separating unit 270, a light detecting unit 275, and a control unit 280.
  • the receiving unit 260 is configured to receive a second light beam sent by the second peer communication device, wherein the second light beam comprises a third optical signal having a first wavelength and a fourth optical signal having a second wavelength.
  • the receiving unit 260 may include a convex lens, and the second light beam may be specifically a parallel beam or an approximately parallel beam.
  • the second peer communication device may be the same or different device as the first peer communication device, which is not limited in this embodiment of the present invention.
  • the wavelength of the third optical signal is a first wavelength, and can be used as communication light for modulating data.
  • the wavelength of the fourth optical signal is a second wavelength, which can be used as beacon light for signal tracking.
  • the rotatable light system 265 is used to guide the transmission direction of the second light beam received by the receiving unit 260.
  • the optical communication device may further include a second collimating unit, which may be used to receive the receipt The optical signal received by element 260 is collimated to obtain a parallel beam.
  • the rotatable optical system 265 can be specifically configured to guide the transmission direction of the parallel beams output by the second collimating unit.
  • the second collimating unit may be located between the receiving unit 260 and the rotatable optical system 265 on the optical path, but the embodiment of the invention is not limited thereto.
  • the rotatable optical system can direct the direction of transmission of the second beam by refracting and/or reflecting the second beam.
  • the rotatable optical system 265 may include a rotatable mirror, such as a Fast Spin Mirror (FSM), which is not limited by the embodiment of the present invention.
  • FSM Fast Spin Mirror
  • the light separating unit 270 is configured to receive the second light beam guided by the rotatable optical system 265, separate the third optical signal and the fourth optical signal, and output the separated third optical signal and the first Four light signals.
  • the light separating unit 270 may be a splitter plate for separating optical signals of the first wavelength and the second wavelength.
  • the first wavelength and the second wavelength are 1550 nm and 775 nm, respectively
  • the light separating unit 270 may include a 1550 nm/775 nm partial wave plate, but the embodiment of the invention is not limited thereto.
  • the light detecting unit 275 is configured to receive the third optical signal of the second light beam transmitted by the light separating unit 270, and perform demodulation processing on the data modulated in the third optical signal.
  • the control unit 280 is configured to receive a fourth optical signal of the second light beam transmitted by the light separating unit 270, and control an angle of the rotatable optical system 265 according to the received fourth optical signal.
  • the optical path direction between the light separating unit 270 and the light detecting unit 275 and the optical path direction between the light separating unit 270 and the control unit 280 may be symmetric with respect to the light separating unit.
  • the third optical signal can pass through the splitter and enter the light detecting unit 275
  • the fourth optical signal can be reflected by the splitter and enter the control unit 280, if the splitter is 45.
  • the optical path direction between the light separating unit 270 and the light detecting unit 275 and the optical path direction between the light separating unit 270 and the control unit 280 may be perpendicular, but the embodiment of the present invention is not limited thereto.
  • control unit 280 may include: a position detecting unit and an adjusting unit, wherein the position detecting unit may be configured to receive the fourth optical signal output by the light separating unit 270, and determine an optical center of the fourth optical signal. Positioning and transmitting information of the position of the optical center to the adjusting unit; the adjusting unit may be configured to receive information of the position of the optical center transmitted by the position detecting unit, and adjust an angle of the rotatable optical system 265 according to the information.
  • the position detecting unit may include a four-quadrant detector, such as an infrared four-quadrant detector or a silicon four-quadrant detector, but the embodiment of the invention is not limited thereto.
  • a four-quadrant detector such as an infrared four-quadrant detector or a silicon four-quadrant detector
  • the optical communication device 200 may further include a focusing lens unit configured to receive the fourth optical signal output by the optical separating unit 270, and focus the fourth optical signal on the position detecting unit, wherein the focusing
  • the lens unit may include a fourth convex lens, but the embodiment of the invention is not limited thereto.
  • the optical communication device 200 may further include a filtering unit located between the focusing lens unit and the position detecting unit on the optical path, and filtering the optical signal of the fourth optical signal except the wavelength of the second wavelength. Signals other than, for example, filtering out optical signals of the first wavelength that have not been separated, and the like.
  • the filtering unit may include the bandpass filter of the second wavelength, but the embodiment of the present invention does not limit this.
  • the adjusting unit may specifically adjust the angle of the rotatable optical system 265 such that the optical center position of the fourth optical signal is at the center of the position detecting unit, and due to the optical separation unit 270 and the light detecting unit 275
  • the optical path direction and the optical path direction between the light separating unit 270 and the control unit 280 may be symmetric with respect to the light separating unit, and the adjusting may be such that the optical center position of the fourth optical signal is located at the center of the light detecting unit 275, but Embodiments of the invention are not limited thereto.
  • FIG. 7 shows another optical communication device 300 provided by an embodiment of the present invention.
  • the optical communication device 300 can include an optical transmitter 310 and a light transmitting antenna 320, where
  • the optical transmitter 310 is configured to transmit a first optical signal having a first wavelength
  • the light emitting antenna 320 is configured to receive the first optical signal emitted by the optical transmitter 310, convert the first partial optical signal in the first optical signal into a second optical signal having a second wavelength, and The communication device transmits the second partial optical signal and the second optical signal of the first optical signal.
  • the second optical signal may serve as beacon light for performing signal tracking
  • the second partial optical signal may serve as communication light for carrying customer data
  • the optical communication device 300 may include one or more optical transmitting antennas 320, which are not limited in this embodiment of the present invention.
  • the optical transmitting antenna 320 may include a receiving unit, a light converting unit, and a sending unit, where the receiving unit may be configured to receive the first optical signal emitted by the optical transmitter 310, where the optical converting unit The first partial optical signal of the first optical signal received by the receiving unit may be converted into a second optical signal having a second wavelength, and the transmitting unit may be configured to send the first light to the first peer communication device. a second portion of the optical signal in the signal and the second optical signal obtained by the optical conversion unit.
  • the receiving unit in the light emitting antenna 320 may include a receiving lens.
  • the optical converting unit and the sending unit in the optical transmitting antenna 320 may be specifically the optical converting unit and the sending unit in the foregoing embodiment, and the specific implementation of the optical converting unit and the sending unit may be described above, in order to Concise, no more details here.
  • the optical transmitting antenna 320 may further include a first collimating unit, configured to receive the first optical signal emitted by the optical transmitter 310, and perform collimation processing on the first optical signal to obtain The first optical signal after collimation processing.
  • the optical conversion unit may be specifically configured to receive the collimated first optical signal output by the first collimating unit.
  • the optical communication device 300 may further include an optical amplifier 330, configured to receive the first optical signal emitted by the optical transmitter 310, perform amplification processing on the first optical signal, and output the amplification process.
  • the first optical signal At this time, the light emitting antenna 320 can be specifically configured to receive the amplified first optical signal output by the optical amplifier 330.
  • the optical communication device 300 may further include a photodetector and a light receiving antenna, wherein the light receiving antenna is configured to receive the second light beam sent by the second peer communication device, wherein the second light beam comprises a third optical signal having a first wavelength and a fourth optical signal having a second wavelength, separating the third optical signal and the fourth optical signal of the second optical beam, and according to the fourth optical signal, the third optical signal The center of the optical signal is adjusted to the center of the receiving fiber, and the third optical signal is output to the photodetector.
  • the photodetector can be configured to receive the third optical signal output by the optical receiving antenna, and perform demodulation processing on the data modulated by the third optical signal.
  • the light receiving antenna may include a receiving unit, a rotatable optical system, a light separating unit, and a control unit, or may further include a second collimating unit.
  • a receiving unit a rotatable optical system
  • a light separating unit a light separating unit
  • a control unit or may further include a second collimating unit.
  • FIG. 8 shows a free space communication system 400 provided by an embodiment of the present invention.
  • the free space communication system includes a first optical communication device 410 and a second optical communication device 420, and an OWC link may exist between the first optical communication device 410 and the second optical communication device 420.
  • the first optical communication device 410 may include a light emitting unit, a light converting unit, and a transmitting unit
  • the second optical communication device 420 may include a receiving unit, a rotatable optical system, a light separating unit, and a light detecting unit. And control unit.
  • the portion of the optical communication device 200 related to the transmission of the optical signal in the foregoing embodiment reference may be made to the portion of the optical communication device 200 related to the transmission of the optical signal in the foregoing embodiment.
  • the second optical communication device 420 reference may be made to the foregoing embodiment.
  • the portion of the optical communication device 200 related to the reception of the optical signal will not be described herein for the sake of brevity.
  • the first optical communication device 410 can include an optical transmitter and a transmit antenna
  • the second optical communication device 420 can include a receive antenna and a photodetector.
  • the first optical communication device 410 refers to the portion of the optical communication device 300 in the foregoing embodiment that is related to the transmission of the optical signal.
  • the second optical communication device 420 refer to the foregoing embodiment.
  • the portion of the optical communication device 300 related to the reception of the optical signal will not be described herein for the sake of brevity.
  • FIG. 9 shows an architectural example of the free space communication system 400 in which it is assumed that the first wavelength is 1550 nm and the second wavelength is 775 nm.
  • the first optical communication device 410 may include a transmitter 411, an EFDA 412, and a transmitting antenna including a convex lens 413, a light converting unit 414, and a convex lens 415.
  • the second optical communication device 420 may include a receiving antenna, a photodetector (PD), and a receiver, wherein the receiving antenna may include a convex lens 421, a convex lens 422, a rotatable mirror 423, a demultiplexing plate 424, and a convex lens 425.
  • QD silicon four quadrant detector
  • the transmitter 411 can emit a light beam having a wavelength of ⁇ (ie, 1550 nm), which is amplified by the EDFA 412 and incident on the convex lens 413 of the transmitting antenna, and the convex lens 413 collimates the received light beam into a parallel light beam, and the light conversion Unit 414 converts a portion of the optical signal in the parallel beam into beacon light having a wavelength of ⁇ /2 (ie, 775 nm) for tracking alignment, with the remaining optical signal of wavelength ⁇ remaining as the communication light.
  • the convex lens 415 transmits a light beam including communication light of a wavelength ⁇ and beacon light of a wavelength of ⁇ /2.
  • the convex lens 421 can receive a light beam including the communication light of the wavelength ⁇ and the beacon light of the wavelength ⁇ /2 transmitted by the convex lens 415, and the light beam is collimated by the convex lens 422 and transmitted to the rotatable mirror 423.
  • the rotatable mirror reflects the beam to the demultiplexing plate 424.
  • the branching wave plate 424 separates the communication light of the wavelength ⁇ in the light beam from the beacon light of the wavelength ⁇ /2, wherein the communication light of the wavelength ⁇ passes through the branching wave plate 424 and reaches the convex lens 4291, and is then focused.
  • the PD 4292 converts the received communication light into an electrical signal and transmits it to the receiver 4293.
  • the beacon light having a wavelength of ⁇ /2 is reflected by the demultiplexing plate 424 to the convex lens 425, and after filtering processing by 426, reaches the QD 427, and the QD 427 can determine the beacon light having the wavelength of ⁇ /2.
  • the center position and the information of the center position is reported to the controller 428, and the controller 428 can adjust the angle of the rotatable mirror 423 according to the information of the center position such that the center position of the beacon light is at the center of the QD .
  • the center position of the beacon light can be located at the center of the PD.
  • FIG. 9 is intended to help those skilled in the art to better understand the embodiments of the present invention and not to limit the scope of the embodiments of the present invention.
  • a person skilled in the art will be able to make various modifications and changes in the embodiments according to the example of FIG. 9. The modifications or variations are also within the scope of the embodiments of the present invention.
  • optical communication device and the free space communication system provided by the embodiments of the present invention are described in detail above with reference to FIG. 2 to FIG. 9.
  • optical communication method provided by the embodiment of the present invention will be described in detail below with reference to FIG.
  • FIG. 10 shows an optical communication method 500 in a free space communication system provided by an embodiment of the present invention.
  • the second wavelength is different from the first wavelength.
  • the first partial optical signal may be up-converted to obtain a second optical signal.
  • the second wavelength is smaller than the first wavelength.
  • embodiments of the invention are not limited thereto.
  • the second partial optical signal may be a portion of the first optical signal other than the first partial optical signal, but the embodiment of the present invention is not limited thereto.
  • the second optical signal and the second partial optical signal may be sent to the first peer communication device in the form of a parallel beam or an approximately parallel beam, wherein the divergence angle of the approximately parallel beam may be
  • the preset condition is satisfied, for example, between 0.2 mrad and 1.5 mrad, but the embodiment of the invention is not limited thereto.
  • the first wavelength may be an even multiple of the second wavelength.
  • S520 may include: performing frequency conversion processing on the first optical signal by using a light frequency doubling crystal, so that the first partial optical signal in the first optical signal is converted into the second optical signal.
  • the distance that the first optical signal is transmitted in the optical frequency conversion crystal can satisfy the above formulas (5) to (9), and is not described herein for brevity.
  • the first optical signal is frequency-converted using a light doubling crystal
  • the method 500 can also include:
  • the first optical signal is subjected to width conversion processing such that the beam width of the first optical signal is changed from the first width to the second width.
  • the frequency converting the first optical signal by using the optical frequency doubling crystal may include: performing frequency conversion processing on the first optical signal of the second width by using the optical frequency doubling crystal.
  • the second width may satisfy the above formulas (7) to (9), and for brevity, no further details are provided herein.
  • S530 may be specifically: sending a first light beam to the first peer communication device, where the first light beam includes the second optical signal and the second partial optical signal.
  • the first light beam may be a parallel light beam or an approximately parallel light beam, which is not limited in this embodiment of the present invention.
  • the method 500 may further include:
  • the first optical signal is subjected to a collimation process to obtain the first optical signal after the collimation process.
  • the first optical signal after the collimation process may be a parallel beam.
  • the method 500 may be performed by the optical communication device 200 or the optical communication device 300 in the above device embodiment, and for brevity, no further details are provided herein.
  • system and “network” are used interchangeably herein.
  • the term “and/or” in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations.
  • the character "/" in this article generally indicates that the contextual object is an "or" relationship.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

L'invention porte sur un dispositif et sur un procédé de communication optique, ainsi que sur une antenne de transmission dans un système de communication optique à espace libre à utiliser dans un alignement d'antenne. Le dispositif de communication optique comprend : une unité électroluminescente afin d'émettre un premier signal optique ayant une première longueur d'onde ; une unité de conversion optique afin de recevoir le premier signal optique transmis par l'unité électroluminescente, la conversion du signal optique de première partie dans le premier signal optique en un second signal optique ayant une seconde longueur d'onde et l'émission du signal optique de seconde partie dans le premier signal optique et le second signal optique, le second signal optique servant de lumière de balise pour effectuer un suivi de signal et le signal optique de seconde partie servant de lumière de communication pour acheminer des données de client ; une unité de transmission, afin de transmettre le signal optique de seconde partie et le second signal optique émis depuis l'unité de conversion optique à un premier dispositif de communication homologue.
PCT/CN2016/110296 2016-12-16 2016-12-16 Dispositif et procédé de communication optique et antenne de transmission dans un système de communication optique en espace libre WO2018107452A1 (fr)

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CN111313967B (zh) * 2019-12-25 2024-05-28 中国电子科技集团公司第三十四研究所 一种长波红外无线光通信的收发分离式光学天线
CN113992267A (zh) * 2020-07-10 2022-01-28 Oppo广东移动通信有限公司 通信控制方法、装置、电子设备及存储介质
CN113992267B (zh) * 2020-07-10 2023-02-28 Oppo广东移动通信有限公司 通信控制方法、装置、电子设备及存储介质
CN114624874A (zh) * 2020-12-08 2022-06-14 军事科学院系统工程研究院网络信息研究所 基于芯片集成光路的光纤-空间光通信信号转换方法
CN114624874B (zh) * 2020-12-08 2023-11-10 军事科学院系统工程研究院网络信息研究所 基于芯片集成光路的光纤-空间光通信信号转换方法
CN115276801A (zh) * 2022-09-19 2022-11-01 西安空间无线电技术研究所 卫星激光通信链路光斑跟踪补偿方法及信号传输方法

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